Please make the whole file into 400 words
Direct 3D-printing of a Geopolymer-based Membrane Dedicated to Cesium Decontamination
Dr Fabien Frizon*, Dr Arnaud Poulesquen, Adrien Gérenton, Svetlana Petlitkaia, Eric Génevé, Bernard MartinezSenior Scientist - Project Manager
French Atomic and Alternative Energy Commission France
Abstract
In the context of the dismantling of industrial sites, the search for efficient and economically competitive solutions for the remediation of installations is a key objective to be achieved, in particular the depollution of industrial effluents containing polluting ions. Compared to other methods, solid / liquid extraction exhibits decisive advantages such as a possible selectivity of the targeted pollutant and the use the solid support as a pollutant containment matrix thus minimizing the volume of secondary wastes generated. In the literature, among many materials used as metal adsorbents (zeolites, apatites, ion exchange resins …), the use of "geopolymer" as exchange materials is also reported. The term "geopolymer" usually denotes alumino-silicate inorganic polymers synthesized at low temperature (typically less than 95 ° C.) by alkaline activation of alumino-silicate materials. The material, which is initially fluid and has no yield stress, set and hardened gradually forming a monolithic material with an amorphous structure and a local order similar to zeolite.
This work considers the fabrication and characterization of geopolymer-based architected membrane dedicated to the treatment of cesium-containing solutions. The key aspects of this study rely on the design of a viscoelastic material with requisite rheological characteristics for direct 3D-printing while controlling the microstructural properties and the ion-exchange properties of the geopolymer ink. This direct writing technic enables the control of the multiscale porous structure: macroporosity can be designed by 3D direct printing while meso and microporosity are controlled by the chemical formulation of the geopolymer ink.
Biography
After a MSc in Mineralogy in 1999 (Univ. Orleans, France), Fabien Frizon pursued his studies with a PhD at the National Institute of Applied Science (Toulouse, France) and received the René Houpert Price from the University Association of Civil-Engineering in 2003. In 2004, he was engaged by the French Atomic and Alternative Energy Commission (CEA) to work on waste conditioning. Appointed Senior Scientist in 2012, he headed the Physical-Chemsitry of Waste Cementation Laboratory from 2012 to 2016. Since 2017, he is Project Manager on the long-term behavior of nuclear glasses and on the multi-physical simulation of vitrification processes at the CEA.
